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RE: pteros have lift-off
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of Tim Williams>
> > And getting back to that arboreal theory, which theropods prior to
> > Archaeopteryx and kin had long forelimbs?
> One of the diagnostic characters of Coelurosauria is:
> "Elongate forelimb exceeds half the length of hindlimb and/or
> presacral vertebral column" (e.g., Gauthier, 1986). This is
> apparent in forms such as _Coelurus_ and _Tanycolagreus_
> (both possibly basal tyrannosaurs), _ornithomimosaurs,
> therizinosaurs, oviraptorosaurs, and deinonychosaurs. These
> taxa, while found in strata not older than _Archaeopteryx_,
> lie outside the clade that includes "_Archaeopteryx_ and kin"
> (by which I interpret to mean Avialae).
_Guanlong_, a basal tyrannosauroid, is older than _Archaeopteryx_.
Additionally, many of the dinosaur-bearing strata in the Morrison are of
Kimmeridgian age, making them older (although not by much) than the
Thomas R. Holtz, Jr.
Email: email@example.com Phone: 301-405-4084
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Senior Lecturer, Vertebrate Paleontology
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Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
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